Thermostat.



L. W. ZBTTLBR.

' THERMOSTAT.

APPLICATION FILED JAN. 8, 1912.

p, Patented Nov. 5, 1912.

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LOUIS W. ZETTLER, OF LOUISVILLE, KENTUCKY.

THERMOSTAT.

To all whom it may concemi i `ie `it knovvn that I, Louis lV. Znrrinnz, a

Vstats, of which the following is a specitication.

- Y, The present invention relates toa thermolo.

stat for use in connection with an electrical clreuit, ttor automatically closing the saine -for ditlerent purposes.

An important object of my invention is to i'generally improve the construction of thermostats, andprovide such a device which 1s formed of few and simple parts.

A further object of my invention is to provide novel adjustable means for determining the degree of heat. at which the defzo..

vice will operate for closing a circuit.

L Other objects and advantages of the 1nventlon will be apparent during the course lof the following description.

In the accompanying drawing forming a. part of thisspecitieation and in which like numerals are employed to designate like parts throughout the same, Figure 1 is av bottom plan view of the device,'showingl it connected in circuit, Fig. 2 is a transverse sectional view through the saine, and Fig. 3 is a plan View of the same.

Inv the drawings wherein is illustrated a preferred embodiment of my invention, the numeral 1 designates the main or body por-A tion of the thermostat, which is preferably cylindrical and formedof insulating material, such as hard rubber, porcelain or glass. This body portion is provided through itsv upper end `with a central opening 2, ,which leads into a 'lower cavity or recess 3, as shown. The recess 3,-has its side wall in the form of steps, providing annular shoulders t and Disposed within the recess 3 and in engagement. with the shoulder 4 is an upper metal plate (hsecurely held in place by screws or bolts 7I and 8. The bolt 7 carries a nut 9, which lits in a pocket. or opening 10, as shown. 4 Theserew S extends upv wardly through 'the body portion l and lin the-body portion l.

passes throi'lgh a met alclamp l1. having its outer end forked, as shown. This metal clamp extends through an opening 12 formed' One tine' 13 of the clampll has an opening formed there- Specification of Letters Patent.

application' led January 8, 1912. Serial No. 670,064.

through for receiving a clamping screw 14, adapted to engage a wire 15,.

Disposed below the metal plate 6` and spaced therefrom is an expansible. metal plate 16, which is much thinner than the plate G and much more sensitive to heat. rl'he metal plate 1G has its inner or central portion bent upwardly, as shown. Means are provided to -tixedly hold the outer portion of thisI cxpansible plate 16, comprising screws or-bolts 17 and 1S. The bolt 18 is provided with a nut 19, disposed in a pocket or opening 20. The screw 17 extends *upwardlj,Y through the body portion 1 and passes through a metal clamp 21, fitting in an opening 22. which is-formed in the body portion l. The metal clamp S21 has its outer end forked. as shown, and one tine thereof is provided with an opening' 22 for receiving a clamping screw 23, which engages a wire lt. is thus seen that the screws S and 17 serve the double purpose of holding respectively the plates G and 16 in place and electrically connecting them with the clamps 1l and 21.

'lhe` wire Q4 is connected with one pole of a source of current 25, the opposite pole of which is connected with -a wire. 26, having connection-with a bell Q7 or'other device to heoperated upon `the closing ofthe oircuit. The wire 15 is also connected with the bell 27'.4

' The rplate G is preferably provided centrally thereof with an opening for receiving a ccntact screw QS, having its lower engaging end preferably tapered or pointed,-as

shown. The serew'QS carries upon opposite sides of the plate G, locking nuts 29, to clamp the sci'rw in adjustment at'clitt'ere11t positions to the plate G. It is thus seen that by proper manipulation of the Contact screw QS -and nutsll, the distance between the pointed end of the screw `and the platev lll-may be varied, thus changing tthe'heat degree at vwhich plate llG'will engage said` screw.

The operation of ,the "device-is as fol- .lowmfVV-hen the plate 16 is subjected to heat, it tends to expandlongitudinally and having end portions held fast it will bend or lbuckle and malte contact-with the adjustable screw 28, to close the circuit. In this circuit current will flow through theWire 2.o from the source of current 25, bell 27,

Wire 15, clamp 11, screw 8, plate 6, contact screw 28, plate 16, screw 17, clamp 2l, and through the Wire 24 back to the source of current., As above stated the heat degree at which the device will operate may be regulated by proper manipulation of the adjustable contact screw 28.

It is to be understood that the form of lny invention herewith shown and described is to be taken as a preferred example ol (he same and that certain changes in the sha-pc, size, and arrangement 'of parts may he resorted to without departing from the spirit of the invention or the scope of the subw joined claims.

Having thus described my invention, l claim 1. In a device of the character described, a body portion formed of insulating material and having a cavity formed therein rovided with a side Wall having shoul ers, spaced yI'netal plates disposedon said shoulmetal clamps extending into said body portion, screws connecting said metal plates and clamps, and a Contact element carried by one metal plat-e.

2. In a device of the character described, an integral body portion formed of insulating material and having' a central opening formed through one end leading into a main cavity, said cavity having its side Wall provided with shoulders, spaced metal plates disposed upon said shoulders, metal connecting' elements extending into tion, screws connect-ing the metal plates with the metal connecting elements, an adjustable contact screw carried by one metal plate and 'lisposed near the cent-ral opening to provide ready access to the same, and a circuit connected with said connecting elements.

In testin'iony whereof I aiix my signature in presence of two Witnesses LOUIS XV. ZETTLER. Witnesses N ELLU: P. SULLIVAN,

HART HUHLEIN.

said body por- 

